相关试卷

Fresh fish should have a mild smell. Strong fish y smell is the first sign to go bad. How does the fishy smell come from?

It can be several days from when the fish are caught to when they reach the supermarket. In that time, bacteria that grow naturally in fish start to consume a substance called trimethylamine N-oxide(TMAO) in fish. These bacteria change TMAO into trimethylamine(TMA), the substance responsible for the fish y smell. Bacteria in fish can also change lysine(赖氨酸) into cadaverine(尸胺),a substance that's associated with breaking down the fish once they are caught and giving off fishy smell.

Chemical reactions can also lead to fishy smell. This happens through the oxidation(氧化) of fat. Fish are an important source of omega-3 fatty acids. When these fats are exposed to oxygen, they oxidize and break down into the substance that you can smell.

To slow down the fishy smell, what is beyond question is that the less time between when the fish are caught and when they reach the kitchen, the better. But today, fish are often flown across the globe. To keep smell-producing bacteria at bay, the fish must be frozen or kept at the low temperature possible as soon as they are caught and cleaned.

Controlling fat oxidation can function as well, especially for fattier fish species. While freezing slows bacterial growth, it does not stop fat oxidation. This reaction will occur as long as oxygen is present. Fatty fish are usually not frozen because, despite the cold temperature, they're going to oxidize pretty fast unless they are stored in a low oxygen container. That's why those species are often canned.

It's also important to remember that smell is not always an indicator of safety, especially in processed fish products. "What you might consider the fish y smell may be a delicacy in another culture," said Carl A. Batt, a professor of food science at Cornell University.

It was 1963 in the Toronto suburb. I was eight years old and hockey(冰球)-crazy. My next-to-zero skills had not stopped my passion for the game. The players of the great hockey club Toronto Maple Leafs were of course my heroes, and their posters and photos covered the walls of my room.

There is always some price to pay for maintaining a love. I raised funds in an old-fashioned way, selling something the public could actually sink their teeth into. I joined the local annual event—Margaret's Doughnuts(甜甜圈) to sell doughnuts, which offered choices of honey-glazed or chocolate-glazed.

Door-to-door I went, notebook in hand to record. I sold dozens of dozens; hardly a soul turned me down. My notebook was almost full, and my stomach was almost empty when I went up the last house on the south side.

I rang the doorbell and went over my speech while staring at the screen door. Suddenly, the door opened. My unforgettable memory was looking up from a large pair of fuzzy slippers, way up, to the face staring down. I stood there speechless for what seemed 10 years, opening and closing my mouth like a fish out of water. Collecting my calmness, but still unable to go into doughnut-promoting overdrive, I told him something he seemed have already known and he replied with a nod and a smile.

I have an unclear memory of murmuring through my speech " Please-buy-some-doughnuts", and then a vivid memory of him taking the notebook from my hand. I followed with new information—that we shared our given name. With pride from our first-name-basis farewells, I flew home holding the notebook tightly to my chest.

The next morning before the school bell, I cautiously showed off the precious paper. It is surely mine alone to claim: I sold a dozen doughnuts to Tim Horton, one of my most respected players who lived a mere three blocks away!

People call walking the "perfect exercise". It gets your heart pumping, clears your head and fills your lungs with fresh air. Not bad, but we found a way to make it even better. Before you take your next 10,000 steps, add a little stick to your stroll. Take a Stawer walking stick anywhere and I promise that you'll feel like a conquering hero. It' s powers will astonish you.

What's the secret?

Our Stawer walking sticks are a tip of the top hat to turn-of-the-century tradition. Today, serious collectors gladly pay thousands for rare and handcrafted sticks from the 19th century. But only Stawer walking sticks can deliver a modern version of these classics that looks and feels as good as the original for only $ 59 each!

Details

·36 inches long. Imported Eucalyptus wood.

·Solid brass handles with varying finishes.

·Rubber tips. Supports up to 250 pounds.

·All models available in 40 inches height.

Your satisfaction 100% guaranteed

Experience the comfort and elegance of our delicate walking sticks for 30 days. If you're not feeling the power, simply send it back within 30 days for a refund(退款) of the item price.

Still hesitate? Come and check out the real users' reviews! Praise for Stawer walking sticks, "An excellent walking stick. Solid and elegant. Perfect for a night out. Well crafted."

Mr Jacob/from Pacific Grove, CA

Limited Edition

Only 500 each available only! These handcrafted beauties take months to craft and are running(not walking) out the door. So, take a step in the right direction. Call today!

English (become) the global language in the last few decades. In today's world, being able to speak English is how you stand out and get ahead.

However, learning English as a foreign language (be) very difficult in the absence of a native language environment. We have little chance to live in an English-speaking country. Therefore, we have to rely on knowledge  we can learn at school. Teachers must make sure that there is  adequate（充足的）amount of input in English conveyed to the students through (vary) mediums. This input must be of high quality. After all, high quality output  (base) on high quality input.

To really get ahead, however, it means (put) in extra work outside of the classroom. Experts say that just 15 minutes of extra-curricular study a day can really speedup foreign language learning. Besides, you need to keep mind why you are learning English. Quite  (simple), in today's world, learning English is one of major (factor) leading to a brighter future and a world of possibilities.